Heating-furnace.



PATENTBD JAN.13, 1903.

F. H'. DANIELS. lHEATING IFURNAGE.'

APPLICATION FILED MAY 2, 190g.l mmwnn DB0. 1a, 1902.

H0 MODEL.

THE Nonms PErEns ca., vmToLlTno.. WASHINGTON. D, c.

UNITED STATES PATENT OFFICE.

FRED H. DANIELS, OF WORCESTER, MASSACHUSETTS.

VHEATING-FURNAGE.

SPECIFICATION forming part of Letters Patent No. 718,433, dated January 13, 1903. Application filed May 2, 1902. Renewed December 18,1902. Serial No. 135,791. (No model.)

To all whom, it may concern:

Be it known that-I, FRED H. DANIELs, a citizen of the United States, residing at Worcester, county of Worcester, State of Massachusetts, have invented certain new andv useful Improvements in Heating-Furnaces; and I do hereby declare the following to bea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it'appertains to make and use the same.

Myinvention relates to'continuous heat-ingfurnaces of a type shown in my application4 led of even date herewith, Serial No. 105,671,` in which the furnace is provided with a long and a short heating-section for receiving cold and hot billets, respectively.

The object of my invention is to provide a composite furnace of this type having the hot-billet section superposed upon and communicating with the cold-billet section and in such relation thereto that the hot billets are charged into the short section at a point intermediate the ends of the long section, where they immediately enter a region of comparatively high vheat. and are forced through the furnace to the delivery end, and the :relatively hot gases of the shorter section are deliected into the longer section to assist in heating the cold billets charged therein. I accomplish these objects by forming the hot-billet section as an enlargement or upward extension of the long or cold-billet section, near the discharge end of the latter,and providing said hot-billet section with a charging inlet-opening above the roof of the longer section, about midway the length of the latter.

My invention is illustrated in the accompanying drawings, in which- Figure l is a longitudinal section through a furnace having a hot-billet section superposed upon a cold-billet section, with separate charging means for each section and a common delivery;and Fig. 2 is a modified form of my invention, showing the hot and cold billet sections provided with separate billet guides or supports leading from the respective charging ends to the individual delivery-openings.

Referring to Fig. l of the drawings, l indicates the main body of a furnace of the continuous type which is constructed in the manner and of the materials commonly employed `in furnaces of this class. This furnace comprises an elongated chamber havinga charging-orifice 2, closed by` a suitable fire-door, and a discharge-opening 3, between which are laid the billet guides or supports 5, which are formed of water-cooled tubes in the manner common to this type of furnaces. This long section constitutes a heating-furnace for cold billets.

f It frequently occurs in rod-mill practice that hot billets coming directly from the bloomingmill are to be superheated before delivery to the rolling-mill, and to provide means for heating these hot billets'without the loss of the relatively hot gases which would be discharged into the stack'at the end of this operation Iprovide the heating-furnace with an upwardly-extendin g chamber 8, extending from the delivery end thereof to a point approximately midway the length of the furnace. This chamber is preferably provided with a deiiecting-roof, as indicated in Fig. 1, and termi nates at its front end in an opening'lO, closed by a suitable fire-door, which opening constitutes the charging-inlet for hot billets. Suitable water-cooled billet guides or supports 6 lead from a point outside of this chamber or short section and above the roof of the main section l, through the charging-opening, into an enlarged fore section or vestibule 9. These guides are deflected at their inner ends to form inclines 7, down which the billets charged intothe furnace slide. In operating this type of furnace cold billets are charged into the long section by any preferred and well-known means and are then advanced along the guides or supports 5 through the furnace, where they are iinally heated and discharged through the delivery-opening 3 onto the conveyors 4:, by which they are carried to the rolling-mill. At the same time hot billets are delivered upon the guides 6 and forced by pusher 11 through the charging-opening 10 above the roof of the main furnace into the fore section-9 of thev upper chamber or hotbillet section, where they slide down the inclined portions 7 of the guides 6 and fall upon the tops of the billets occupying the guides 5, which billets have been pushed through from the charging end of the cold Section, but which at this time have at- ICO tained approximately the heat of the hot billets. The two sets of billets are thereafter pushed through the furnace two deep and delivered to the conveyer. lt will thus be seen that the billets on the guides 5 are one row deep before reaching the point where the hot billets are discharged upon them and are two rows deep thereafter as long as the hot billets are charged.

In Fig. 2 asimilar construction is employed, except that the hot billets which are delivered on the roof of the main furnace at a point about half-way between the ends thereof do not fall upon those being fed through from the cold section, but are advanced through the hot section upon separate guides or supports 6', resting upon suitably-cooled crosspipes 62. It will be seen that the cold billets are fed continuously through the long section of the furnace on the guide 5 and discharged by way of the delivery-outlet 3',while the hot billets charged in through the opening 10 pass along the guides 6 through the upper section, which embraces the region of highest heat, where they are superheated and pass out by way of the delivery-outlet 32, falling upon a delecting shield 4', which in turn delivers the su perheated billets to the con veyeret.

In both of these forms the furnaces are fired, preferably, from a common source near the delivery end, and the enlarged chamber or hot-billet section is subjected to the intense heat required to superheat the billets sufficiently to be operated upon by lthe rolls, and the comparatively hot gases which pass from the upper chamber are then carried into the lower strata of gases contained in the long cold-billet section and serve to increase the temperature at the charging end of the coldbillet section.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A furnace of the continuous type, comprising intercommunicating sections one superposed upon the other, one of said sections being shorter than the other, and means for charging the shorter section with hot billets and the longer section with cold billets.

2. A furnace of the continuous type, comprising a long lower section for cold billets and a relatively short upper section for hot billets comm unicating with said lower section, and billet guides or supports leading from the charging ends of each section into the respective sections, whereby cold and hot bi1- lets may be charged into the lower and upper sections respectively.

3. A furnace of the continuons type, comprising intercommunicating sections one superposed upon the other, the upper section being shorter than the lower section and having its charging end above the top wall of the lower section and intermediate the ends thereof and billet guides or supports leading from the charging ends to the delivery ends of the respective sections.

4. A furnace of the continuous type, comprising a cold-billet section and a relatively short hot-billet section formed as an upward extension of the cold-billet section adjacent to the delivery end thereof, said hot-billet section being provided with a charging-opening above the long section and intermediate the ends thereof, and means for charging the sections with billets.

In testimony whereof I affix my signature in presence of two witnesses.

FRED H. DANIELS.

Witnesses:

PHILIP W. MoEN, H. G. STODDARD. 

